From 680ee8adeb02bb94097a6e1f0a38e2f9ae017138 Mon Sep 17 00:00:00 2001
From: Denis Nutiu <denis.nutiu@gmail.com>
Date: Tue, 10 Dec 2024 18:45:46 +0200
Subject: [PATCH] add command line arguments via clap crate

---
 Cargo.lock  | 43 ++++++++++++++++++++++++++++++++++++++++++-
 Cargo.toml  |  1 +
 src/main.rs | 18 ++++++++++++++----
 3 files changed, 57 insertions(+), 5 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index f394490..1337e03 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,12 +1,13 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "Chip8Emulator"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "clap",
  "crossterm",
  "env_logger",
  "log",
@@ -124,6 +125,46 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "clap"
+version = "4.5.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3135e7ec2ef7b10c6ed8950f0f792ed96ee093fa088608f1c76e569722700c84"
+dependencies = [
+ "clap_builder",
+ "clap_derive",
+]
+
+[[package]]
+name = "clap_builder"
+version = "4.5.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "30582fc632330df2bd26877bde0c1f4470d57c582bbc070376afcd04d8cb4838"
+dependencies = [
+ "anstream",
+ "anstyle",
+ "clap_lex",
+ "strsim",
+]
+
+[[package]]
+name = "clap_derive"
+version = "4.5.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ac6a0c7b1a9e9a5186361f67dfa1b88213572f427fb9ab038efb2bd8c582dab"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "clap_lex"
+version = "0.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f46ad14479a25103f283c0f10005961cf086d8dc42205bb44c46ac563475dca6"
+
 [[package]]
 name = "colorchoice"
 version = "1.0.3"
diff --git a/Cargo.toml b/Cargo.toml
index aed2421..4e31099 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,6 +13,7 @@ anyhow = "1.0.93"
 ratatui = "0.29.0"
 crossterm = "0.28.1"
 rand = "0.8.5"
+clap = { version = "4.5.23", features = ["derive"] }
 
 [dev-dependencies]
 pretty_assertions = "1.4.1"
diff --git a/src/main.rs b/src/main.rs
index 689c7e3..7e8ab23 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,9 +2,8 @@ use crate::display::RatatuiDisplay;
 use crate::emulator::Emulator;
 use crate::input::CrossTermInput;
 use crate::sound::TerminalSound;
+use clap::Parser;
 use env_logger;
-use std::env;
-use std::path::PathBuf;
 
 mod display;
 mod emulator;
@@ -13,12 +12,23 @@ mod instruction;
 mod sound;
 mod stack;
 
+#[derive(Parser, Debug)]
+#[command(
+    version = "1.0",
+    about = "A Chip8 emulator.",
+    long_about = "A program which emulates the Chip8 system."
+)]
+struct CliArgs {
+    /// The path to the ROM file to emulate.
+    rom_path: String,
+}
+
 fn main() -> Result<(), anyhow::Error> {
     env_logger::init();
-    let rom_path = PathBuf::from(env::args().skip(1).next().expect("rom path not provided."));
+    let args = CliArgs::parse();
 
     let mut emulator = Emulator::new(RatatuiDisplay::new(), TerminalSound, CrossTermInput::new());
-    emulator.emulate(rom_path.to_str().unwrap())?;
+    emulator.emulate(args.rom_path)?;
 
     Ok(())
 }